CN101623629B - Oxidation catalyst - Google Patents
Oxidation catalyst Download PDFInfo
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- CN101623629B CN101623629B CN2009101500850A CN200910150085A CN101623629B CN 101623629 B CN101623629 B CN 101623629B CN 2009101500850 A CN2009101500850 A CN 2009101500850A CN 200910150085 A CN200910150085 A CN 200910150085A CN 101623629 B CN101623629 B CN 101623629B
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- oxide
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- 239000003054 catalyst Substances 0.000 title claims abstract description 58
- 230000003647 oxidation Effects 0.000 title claims abstract description 40
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 40
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 37
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 37
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 30
- 239000010936 titanium Substances 0.000 claims abstract description 23
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 17
- 238000000465 moulding Methods 0.000 claims abstract description 17
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 239000011224 oxide ceramic Substances 0.000 claims abstract description 11
- 229910052574 oxide ceramic Inorganic materials 0.000 claims abstract description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 9
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000010970 precious metal Substances 0.000 claims abstract description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract 4
- 239000011651 chromium Substances 0.000 claims description 38
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 33
- 229910000510 noble metal Inorganic materials 0.000 claims description 29
- 150000004706 metal oxides Chemical class 0.000 claims description 16
- 229910052684 Cerium Inorganic materials 0.000 claims description 15
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 14
- 229910052763 palladium Inorganic materials 0.000 claims description 14
- 229910052719 titanium Inorganic materials 0.000 claims description 14
- 229910052804 chromium Inorganic materials 0.000 claims description 13
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 12
- 239000011575 calcium Substances 0.000 claims description 11
- 239000011777 magnesium Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- 229910052773 Promethium Inorganic materials 0.000 claims description 7
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 7
- 239000004411 aluminium Substances 0.000 claims description 7
- 229910052788 barium Inorganic materials 0.000 claims description 7
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052793 cadmium Inorganic materials 0.000 claims description 7
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 7
- 229910052733 gallium Inorganic materials 0.000 claims description 7
- 229910052738 indium Inorganic materials 0.000 claims description 7
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 7
- 229910052747 lanthanoid Inorganic materials 0.000 claims description 7
- 150000002602 lanthanoids Chemical class 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- VQMWBBYLQSCNPO-UHFFFAOYSA-N promethium atom Chemical compound [Pm] VQMWBBYLQSCNPO-UHFFFAOYSA-N 0.000 claims description 7
- 229910052712 strontium Inorganic materials 0.000 claims description 7
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 7
- 229910052713 technetium Inorganic materials 0.000 claims description 7
- GKLVYJBZJHMRIY-UHFFFAOYSA-N technetium atom Chemical compound [Tc] GKLVYJBZJHMRIY-UHFFFAOYSA-N 0.000 claims description 7
- 229910052718 tin Inorganic materials 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 7
- 239000002912 waste gas Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000000470 constituent Substances 0.000 claims description 5
- 150000002739 metals Chemical class 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 3
- 241001466460 Alveolata Species 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 abstract description 8
- 238000010992 reflux Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 22
- 238000006243 chemical reaction Methods 0.000 description 12
- 238000012360 testing method Methods 0.000 description 11
- 230000003197 catalytic effect Effects 0.000 description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 9
- PHFQLYPOURZARY-UHFFFAOYSA-N chromium trinitrate Chemical compound [Cr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PHFQLYPOURZARY-UHFFFAOYSA-N 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 6
- 239000010948 rhodium Substances 0.000 description 6
- 230000010718 Oxidation Activity Effects 0.000 description 5
- 229910052697 platinum Inorganic materials 0.000 description 5
- 229910052703 rhodium Inorganic materials 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 229910000349 titanium oxysulfate Inorganic materials 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 239000012876 carrier material Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000002688 persistence Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000001294 propane Substances 0.000 description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- RQNVXBOMCWPFQE-UHFFFAOYSA-N [Ti].[Cr].[Ce] Chemical compound [Ti].[Cr].[Ce] RQNVXBOMCWPFQE-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- RMXTYBQNQCQHEU-UHFFFAOYSA-N ac1lawpn Chemical compound [Cr]#[Cr] RMXTYBQNQCQHEU-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- CKMNQZXKOURUMB-UHFFFAOYSA-N cerium dimer Chemical compound [Ce]#[Ce] CKMNQZXKOURUMB-UHFFFAOYSA-N 0.000 description 1
- UOUJSJZBMCDAEU-UHFFFAOYSA-N chromium(3+);oxygen(2-) Chemical group [O-2].[O-2].[O-2].[Cr+3].[Cr+3] UOUJSJZBMCDAEU-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012050 conventional carrier Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/26—Chromium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/64—Platinum group metals with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/652—Chromium, molybdenum or tungsten
- B01J23/6522—Chromium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/16—Selection of particular materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/103—Oxidation catalysts for HC and CO only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/206—Rare earth metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20707—Titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/12—Metallic wire mesh fabric or knitting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention provides a catalyst used for selectively oxidizing hydrocarbons relative to carbon monoxide, which is a mixed oxide composed of Ce<0.1-0.5>Ti<0.2-0.8>Cr<0.1-0.5>OX. Especially the mixed oxide is used as a coating for fixing on a molding body, or the mixed oxide is doped with precious metal whose weight percentage is less than 0.5%. According to the invention, the exhaust gas is purified by the mixed oxide composed of Ce<0.1-0.5>Ti<0.2-0.8>Cr<0.1-0.5>OX as catalyst, thereby oxidizing the oxidized exhaust gas component. Especially relative to carbon monooxide or nitric oxide, the hydrocarbon is oxidized selectively and preferentially. The oxidation catalyst for producing internal combustion engines is a fixed oxide which is composed of cerium oxide, titanium oxide, chromic oxide as well as other metallic oxide components if possible, and is fixed on the molding body with high-temperature stability of metal or oxide or carbide, or the fixed on a oxide ceramic, and the oxideceramic is fixed on the molding body, wherein the molding body especially has a wire mesh structure or a honeycomb structure (honeycomb), or an oxide ceramic central layer is fixed thereon. In a device with an combustion-chamber and a exhaust emission tube connected therewith or a exhaust gas reflux pipe, according to the invention, the oxiadition catalyst is fixed with fixed oxide composed of cerium oxide, titanium oxide and chromic oxide.
Description
Technical field
The present invention relates to a kind of catalyst, be used for oxidation gaseous effluent composition when temperature is between 200 degrees centigrade to 1000 degrees centigrade, it preferentially makes hydrocarbon oxidized before carbon monoxide.
Background technology
Contain the noble metal mass percent and be the noble metal catalyst of 0.1% to 5% (relevant to the oxidation carrier quality), more than 200 degrees centigrade, especially more than 300 degrees centigrade the time, demonstrate fine or even fabulous oxidation effectiveness in temperature.Such cover system is when especially surpassing 850 degrees centigrade in the face of higher temperature, and its persistence need to be improved with higher bullion content.
The mixed oxide catalyst that does not contain the noble metal supplementary element fully has enough oxidation activities under lower space flow speed.Under normal conditions, the operating temperature of its performance during oxidation, on part apparently higher than noble metal catalyst.Persistence when it faces high temperature generally all is inferior to noble metal catalyst.In addition, non-precious metal catalyst more optionally acts on carbon monoxide, so to oxidation of hydrocarbons and be not suitable for.
Summary of the invention
Task of the present invention is, a kind of catalyst is provided, itself or do not contain or only contain less noble metal composition, can work lastingly at higher temperature, and oxidation of hydrocarbons optionally.
The solution of this task of the present invention is the mixed oxide that is comprised of the oxide of elemental cerium (Cer), titanium (Titan) and chromium (Chrom) by a kind of, especially is arranged on a kind of pottery carrier material.Preferably, this mixed oxide precipitation ceramics based at this, especially be on the carrier of aluminium oxide.In improvement project according to the present invention, also add a kind of noble metal composition, it is especially palladium (Palladium), its mass percent is especially lower than 0.02% lower than 0.05%.According to the present invention, by being doped into palladium (Palladium), can obtain only to reach 1% to the 5% obtainable catalytic effect of ability in the noble metal mass percent under prior art.
The solution of this task of the present invention is that the feature by main claim realizes.Dependent claims has been described preferred embodiment.
According to the present invention, by means of a kind of mixed oxide of elemental cerium (Cer), titanium (Titan) and chromium (Chrom), make the oxidation of hydrocarbon occur in temperature higher than 400 degrees centigrade, be especially during higher than 500 degrees centigrade.The mixed oxide of such catalyst property can be fixed on a carrier easily, is for example on traditional metal beehive (honeycomb) carrier.Particularly, it is for example on alumina ceramic carrier that this mixed oxide also can be fixed on a pottery carrier, and the composite construction (Verbund) that this mixed oxide and pottery carrier material consist of, being fixed on conventional carriers in intermediate layer (Washcoat) mode is for example on metal beehive carrier.
Preferably, titanium oxide is the main component of this mixed oxide catalyst, and especially its mass percent can be 40% to 60%.Three kinds of metal oxide constituents of this mixed oxide catalyst, the mass percent of each all is at least 10%, especially more than 15%, wherein the ratio of cerium (Cer) is preferably between 10% to 30%, especially be between 15% to 25%, the ratio of chromium oxide is preferably between 20% to 40%, is especially between 25% to 35%.And wherein the proportionate relationship of cerium (Ce) and titanium (Ti) and chromium (Cr) is in particular 2: 5: 3, and error range 20% is especially 10%.
The mixed oxide that such cerium oxide, titanium oxide, chromium oxide form, also can contain other metal oxide compositions, metal in wherein said other metal oxides is by choosing in following element set, that is: magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), aluminium (Al), gallium (Ga), indium (In), tin (Sn), and atomic number is until 79 transition elements (except technetium (Tc) and cadmium (Cd)), and lanthanide series (except promethium (Pm)).General its molecular formula of mixed oxide is: Ce
0.1-0.5Ti
0.2-0.8Cr
0.1-0.5Me
0.0-0.2O
X, be in particular Ce
0.2-0.5Ti
0.3-0.7Cr
0.2-0.5Me
0.0-0.1O
X
Such non-precious metal catalyst is applicable to when temperature is between 300 degrees centigrade to 1000 degrees centigrade the hydrocarbon in oxidation gaseous effluent optionally, namely with respect to carbon monoxide and the preferential oxidation hydrocarbon.Higher than 700 degrees centigrade, in the time of particularly higher than 850 degrees centigrade, its high-temperature and durable is better than a lot of noble metal catalysts in the practical application temperature.
According to the present invention, this with respect to the catalyst of carbon monoxide selective ground oxidation of hydrocarbons, is by CeO
2, TiO
2And Cr
2O
3A kind of mixed oxide that forms.So just can realize a kind of waste gas purification agent based on a kind of mixed oxide as catalyst, by this cleanser, make that the oxidable constituent of waste gas is oxidized to be fallen.Particularly to have precedence over carbon monoxide oxidized for hydrocarbon.In essence, such mixes by cerium-titanium-chromium the oxidation catalyst that oxide forms, and need to be applicable to all technological processes of complete oxidation, for example is used to the purification of industrial waste gas or is applied as diesel oxidation catalyst.A kind of like this catalyst mode that is comprised of the mixed oxide of cerium-titanium-chromium is specially adapted in the put-put application, for reducing its hydrocarbon emission amount.
In order to reduce the catalyst required minimum temperature of playing effectiveness, particularly to be down to below 400 degrees centigrade, so mixed oxide catalyst also will be doped into noble metal in addition, is in particular palladium (Palladium) or silver (Silber).Wherein noble metal component ratio but, with the past temperature lower than 400 degrees centigrade of intervals in platinum/rhodium (Pt/Rh) catalyst of the identical catalytic action of performance compare, be to have greatly reduced.Platinum wherein and rhodium (Pt and Rh) also can replace by other noble metals, particularly silver (Ag), palladium (Pd) and iridium (Ir).Particularly wherein the employing of noble metal compared with prior art, has reduced an order of magnitude at least.It is 1% to 5% noble metal that existing noble metal catalyst has mass percent with respect to carrier material, be in particular expensive noble metal platinum and rhodium (Pt and Rh), and according to the present invention, only need the mass percent of noble metal for particularly to get final product lower than 0.2% lower than 0.5%, because in fact according to the present invention, the mass percent of noble metal is 0.005% just enough to have realized in situation effect that the catalyst based on noble metal can reach.Wherein according to the present invention, only need cheap Precious Metals-Gold (Au), ruthenium (Ru), iridium (Ir) particularly the mass percent of palladium (Pd) and silver (Ag) be particularly just enough lower than 0.2% lower than 0.5%.
Compare with noble metal catalyst, can realize significantly less use noble metal according to the present invention, and have comparable catalytic activity, and have at high temperature better persistence.Further, also can realize for the first time a kind of mixed oxide catalyst, it is with the very high selection functionality to hydrocarbon.When just needing the performance catalytic action between 200 degrees centigrade to 300 degrees centigrade when, to be doped into noble metal in this mixed oxide especially.
Also can further realize a kind of simple especially manufacture method according to the present invention.In order to make a kind of oxidation catalyst for internal combustion engine, a kind of mixed oxide that is comprised of cerium oxide (IV), titanium oxide (IV), chromium oxide (III) will be fixed on a molding body or oxide ceramics.The method of having verified can be infiltrated this molding body by the aqueous solution of this mixed oxide, and then makes this quilt be mixed the molding body drying that oxide infiltrated.The method of also having verified also can make this mixed oxide precipitate on this molding body.This molding body is in particular metal or oxide or carbide by the high-temperature stable material and consists of.Preferably, this molding body is cellular (honeycomb) structure or wire braid structure.Particularly preferably, this mixed oxide can be fixed on oxide ceramics, and oxide ceramics is fixed on a molding body.The oxide ceramics of configuration also can be expressed as intermediate layer (Washcoat) like this.If possible, this mixed oxide also contains other metal oxide, metal in wherein said other metal oxides is by choosing in following element set, that is: magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), aluminium (Al), gallium (Ga), indium (In), tin (Sn), and atomic number is until 79 transition elements (except technetium (Tc) and cadmium (Cd)), and lanthanide series (except promethium (Pm)).The chief component composition of this mixed oxide is in particular CeO
2, TiO
2And Cr
2O
3, additional constituent or alloy are other metal oxide.
This mixed oxide is suitable for as the oxidation catalyst in the combustion chamber, particularly is applied to make full combustion of fuel in internal combustion engine.Also can be by this oxidation catalyst, make hydrocarbon in exhaust pipe or oxidized in the exhaust gas recirculation pipe.According to the present invention, a kind of device is provided, have a combustion chamber and coupled exhaust pipe or exhaust gas recirculation pipe, in this device, be fixed with the mixed oxide that this is comprised of cerium oxide, titanium oxide, chromium oxide, as oxidation catalyst.
In this device, the metallic atom ratio is in particular:
The ratio of cerium (Ce) is preferably between 0.2 to 0.5 between 0.1 to 0.5,
The ratio of titanium (Ti) is preferably between 0.3 to 0.7 between 0.2 to 0.8,
The ratio of chromium (Cr) is preferably between 0.2 to 0.5 between 0.1 to 0.5,
if wherein mixed oxide might also contain other metal oxide compositions, metal in wherein said other metal oxides is by choosing in following element set, that is: magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), aluminium (Al), gallium (Ga), indium (In), tin (Sn), and atomic number is until 79 transition elements (except technetium (Tc) and cadmium (Cd)), and lanthanide series (except promethium (Pm)), wherein the atomic ratio of these other metals adds up between 0 to 0.2, be preferably between 0 to 0.1.
The selection meeting of pottery carrier causes some impacts to catalytic activity, high-temperature stability and the oxidation catalyst platability on the molding body of metallicity, pottery or carbide.
By adopting the Al of catalytically inactive
2O
3, can improve its platability and heat endurance especially.In this case, the basic surface (basische of aluminium oxide
) can realize better being connected with its oxidisability of molding body is surperficial, and the supporting structure of a temperature stabilization is provided for mixed oxide.
And the CeO for example of the carrier by adopting catalytic activity
2, can improve especially oxidation activity.
By adopt catalytically inactive carrier Al for example
2O
3, and the carrier of catalytic activity CeO for example
2, can promote platability, attachment coefficient, temperature stability and oxidability.
Mixed oxide catalyst fixing on a pottery carrier can be to adjust between 5: 1 to 1: 3 in the proportionate relationship of mixed oxide and carrier, is preferably 3: 1 to 1: 1.Especially its proportionate relationship be turn out to be between 7: 3 to 6: 4 the time particularly active.
Same, in order to realize the support to the oxidation activity of noble metal catalyst, this mixed oxide can be used through after physical mixed with noble metal catalyst, realizes reducing the consumption of noble metal.
A kind of non-precious metal catalyst of relevant optionally oxidation of hydrocarbons therewith is particularly suitable for for the temperature of the put-put waste gas higher than 850 degrees centigrade, and with respect to carbon monoxide and the preferential oxidation hydrocarbon.And only need to mix and be doped into mass percent in oxide is 0.01% to 0.05% noble metal, particularly palladium (Pd), can realize a kind of active oxidation catalyst that possesses during lower than 300 degrees centigrade in temperature.
In the combustion chamber or in exhaust pipe or in the exhaust gas recirculation pipe, adopt a kind of so mixed oxide that is formed by cerium oxide, titanium oxide, chromium oxide as oxidation catalyst, saved adopted noble metal so far, in the metallic atom ratio be particularly:
The ratio of cerium (Ce) is preferably between 0.2 to 0.4 between 0.1 to 0.5,
The ratio of titanium (Ti) is preferably between 0.3 to 0.7 between 0.2 to 0.8,
The ratio of chromium (Cr) is preferably between 0.2 to 0.4 between 0.1 to 0.5,
If wherein mixed oxide might also contain other metal oxide compositions, metal in wherein said other metal oxides is by choosing in following element set, that is: magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), aluminium (Al), gallium (Ga), indium (In), tin (Sn), and atomic number is until 79 transition elements (except technetium (Tc) and cadmium (Cd)), and lanthanide series (except promethium (Pm)).Wherein the atomic ratio of these other metals adds up between 0 to 0.2.
Description of drawings
The below further states the present invention according to example with reference to some charts.
Fig. 1: show after having adopted according to mixed oxide catalyst of the present invention the conversion ratio of hydrocarbon and carbon monoxide;
Fig. 2: show its hydrocarbon of mixed oxide fixing on the oxide ceramics carrier and the conversion ratio of carbon monoxide and temperature correlation;
Fig. 3: disclose doped with its hydrocarbon of mixed oxide catalyst of palladium (Palladium) and the conversion ratio of carbon monoxide;
Respectively all to be 6% CO by percent by volume in each example, 8.7% CO
2, 4.5% O
2, 1.1% propane and other are N
2The mix waste gas that forms, its space flow speed is 100000/ hour, carries out catalysis by the catalyst of describing to the example 3 in example 1.
The specific embodiment
Example 1:
Ce-Ti-Cr mixes oxide, and its proportionate relationship is 20: 50: 30.
230.9 the chromic nitrate of gram (III) is dissolved in the VEW (the pH value is 0.94) of 300 milliliters.102.4 the titanyl sulfate solution of the cerous nitrate solution of gram (containing 19.5% cerium) and 521.6 grams is joined titanyl sulfate solution in chromium nitrate solution by weighed.Again cerous nitrate solution is added afterwards.12.5% the NH of 600 milliliters
3Solution is placed in a container, and this Ce-Ti-Cr solution is slowly splashed into NH
3Go in solution.In this adding procedure, its pH value is all the time by extra NH
3Solution and remaining on greater than in 7 scope.The Ce-Ti-Cr oxide that is settled out is filtered off and is washed to without sulfate.The powder that so obtains is by dry under 110 degrees centigrade, and carries out the tempering of 4 hours under 500 degrees centigrade.At last, but this powder rolled in a kind of intermediate layer slurry of coating and gone.For it is carried out the test of catalytic activity, honeycomb metal is carried out coating with the coating amount of 200 gram/litres, and tests in a forming gas testing equipment.
The conversion ratio of drawn hydrocarbon and carbon monoxide and temperature correlation is shown in Figure 1.
Example 2:
Al
2O
3-Ce-Ti-Cr mixes oxide, and its proportionate relationship is Al
2O
3Be 40% and the mixed oxide of Ce-Ti-Cr be 60%, and the proportionate relationship of Ce-Ti-Cr oxide is 20: 50: 30.
According to example 1, a kind of sedimentation agent is by cerous nitrate solution, titanyl sulfate solution and chromium nitrate solution manufacturing.A kind of gamma Yangization Aluminum of commercialization is suspended in water, and passes through NH
3Solution remains between 8 to 9 its pH value.Then this Ce-Ti-Cr solution in the situation that pH controlled (the pH value is greater than 7) slowly splashed into.Ce-Ti-Cr oxide in alumina surface precipitation is filtered off, and is washed to without sulfate drying and tempering.But last this powder is rolled in a kind of intermediate layer slurry of coating and is gone.For it is carried out the test of catalytic activity, honeycomb metal is carried out coating with the coating amount of 200 gram/litres, and tests in a forming gas testing equipment.
The conversion ratio of drawn hydrocarbon and carbon monoxide and temperature correlation is shown in Figure 2.
Example 3:
0.018 the palladium of gram/litre (Pd)-Al
2O
3-Ce-Ti-Cr mixes oxide, and its proportionate relationship is Al
2O
3Be 40% and the mixed oxide of Ce-Ti-Cr be 60%, and the proportionate relationship of Ce-Ti-Cr oxide is 20: 50: 30.
According to example 1, a kind of sedimentation agent is created by cerous nitrate solution, titanyl sulfate solution and chromium nitrate solution.A kind of gamma-Yangization Aluminum of commercialization is suspended in water, and passes through NH
3Solution remains between 8 to 9 its pH value.Then this Ce-Ti-Cr solution in the situation that pH controlled (the pH value is greater than 7) slowly splashed into.Ce-Ti-Cr oxide in the alumina surface precipitation is filtered off, and is washed to sulfate radical-free (sulfatfrei), drying and tempering.But last this powder is rolled in a kind of intermediate layer slurry of coating and is gone.According to the solid matter content of intermediate layer slurry, then to splash into a kind of pH value be 4 palladium nitrate solution, makes the content of noble metal remain the palladium (Pd) that contains 0.018 gram/litre (0.5 gram/cubic feet).For it is carried out the test of catalytic activity, honeycomb metal is carried out coating with the coating amount of 200 gram/litres, and tests in a forming gas testing equipment.
The conversion ratio of drawn hydrocarbon and carbon monoxide and temperature correlation is shown in Figure 3.
Other proportionate relationship of mixed oxide realizes by making different mixed oxide powders, subsequently they all in a tubular reactor as drying and powder calcination, contain CO, propane and O at same
2Waste gas (wherein percent by volume is 5.5% CO, 8% CO
2, 5% O
2, 1% propane and other are N
2) in test.Test result is shown in table 1.The hydrocarbon that these represent with percentage and the conversion ratio of CO are 350 degrees centigrade corresponding to temperature, and space flow speed is the situation of 150000/ hour.
Making a kind of ratio is the mixed oxide of cerium 60-titanium 20-chromium 20, when comparing with the ratio mixed oxide that is cerium 70-titanium 20-chromium 10, on the activity to oxidizing hydrocarbon, and on hydrocarbon conversion and carbon monoxide conversion selective, all produced a comparable result.And as with the contrast of this a kind of powder, be the mixed oxide form of the composition of cerium 20-titanium 50-chromium 30 in the ratio of aforementioned middle description, active and noticeable due to extra high oxidizing hydrocarbon.
And a kind of mixed oxide that is formed by Ce-Ti, on the contrary without any the oxidizing hydrocarbon effect.A kind of mixed oxide that is comprised of Ce-Cr has shown that appropriate oxidizing hydrocarbon is active, but only has very poor selective to hydrocarbon conversion.The another kind of mixed oxide that is comprised of Ti-Cr has shown well selectively, but compares with the mixed oxide of Ce-Ti-Cr, to the but obviously reduction of oxidation activity of oxidizing hydrocarbon.Be unique constituent as oxidation catalyst the time when adopting respectively Ce, Ti, Cr, only have Ce to demonstrate to have but lower oxidation activity still, and hydrocarbon and CO are had equal oxidation.Ti has demonstrated with respect to the CO oxidation only has inappreciable oxidation to hydrocarbon, and Cr only has inappreciable oxidation with respect to the oxidizing hydrocarbon effect to CO.
Table 1
| Ce | Ti | Cr | The HC conversion ratio | The CO conversion ratio | |
| Example 4 | 60 | 20 | 20 | 55 | 17 |
| Example 5 | 70 | 20 | 10 | 48 | 17 |
| Example 6 | 20 | 50 | 30 | 75 | 18 |
| Contrast 1 | 29 | 71 | 0 | 0 | 5 |
| Contrast 2 | 40 | 0 | 60 | 32 | 20 |
| Contrast 3 | 0 | 63 | 37 | 32 | 2 |
| Contrast 4 | 100 | 0 | 0 | 22 | 22 |
| Contrast 5 | 0 | 100 | 0 | 0 | 8 |
| Contrast 6 | 0 | 0 | 100 | 8 | 0 |
Claims (15)
1. catalyst is used for respect to carbon monoxide and oxidation of hydrocarbons optionally, it is characterized in that, described catalyst is a kind of mixed oxide based on metallic cerium, titanium, chromium.
2. catalyst according to claim 1, is characterized in that, described mixed oxide is used as coating and is fixed on molding body.
3. catalyst according to claim 1 and 2, is characterized in that, described mixed oxide-dopedly have mass percent to be less than 0.5% noble metal.
4. the method for a waste gas purification, is characterized in that, comes by the mixed oxide based on metallic cerium, titanium, chromium as catalyst the exhaust gas constituents that oxidation can be oxidized.
5. method according to claim 4, is characterized in that, with respect to carbon monoxide or nitric oxide, hydrocarbon is preferentially oxidized.
6. method, for the manufacture of the oxidation catalyst that is used for internal combustion engine, it is characterized in that, a kind of mixed oxide that is become to be grouped into by cerium oxide, titanium oxide, chromium oxide and optional other metal oxides that exist, metal in wherein said other metal oxides is by choosing in following element set, that is: magnesium, calcium, strontium, barium, aluminium, gallium, indium, tin, and atomic number is until 79 transition elements, except technetium and cadmium; And lanthanide series, except promethium; Described mixed oxide is fixed on the molding body of high-temperature stable of metal or oxide or carbide, or is fixed on oxide ceramics, and described oxide ceramics is fixed on molding body.
7. the method for manufacturing oxidation catalyst according to claim 6, is characterized in that, described molding body is wire braid structure or alveolate texture.
8. the manufacture method of according to claim 6 or 7 described manufacturing oxidation catalysts, is characterized in that, the described oxide ceramics that is fixed with described mixed oxide is the intermediate layer.
9. device, have a combustion chamber and coupled exhaust pipe or exhaust gas recirculation pipe, it is characterized in that, be fixed with the described mixed oxide based on cerium oxide, titanium oxide, chromium oxide in described device, described mixed oxide is as oxidation catalyst.
10. device according to claim 9, is characterized in that, in described mixed oxide, the molar ratio of metal closes and is
The ratio of cerium is 0.1 to 0.5,
The ratio of titanium is 0.2 to 0.8,
The ratio of chromium is 0.1 to 0.5,
Wherein said mixed oxide also contains other metal oxide compositions, metal in wherein said other metal oxides is by choosing in following element set, that is: magnesium, calcium, strontium, barium, aluminium, gallium, indium, tin, and atomic number is until 79 transition elements, except technetium and cadmium; And lanthanide series, except promethium; The atomic ratio of wherein said these other metals adds up between 0 to 0.2.
11. according to claim 9 or 10 described devices is characterized in that, described mixed oxide-doped mass percent is arranged is 0.001% to 0.1% palladium.
12. non-precious metal catalyst, be applicable to when temperature is between 300 degrees centigrade to 1000 degrees centigrade, the hydrocarbon in oxidation put-put waste gas optionally, namely with respect to carbon monoxide and the preferential oxidation hydrocarbon, it is characterized in that, described catalyst is a kind of mixed oxide catalyst that is comprised of metallic cerium, titanium, chromium.
13. one kind based on the mixed oxide of cerium oxide, titanium oxide, chromium oxide as in the combustion chamber or in exhaust pipe or the application of the oxidation catalyst in the exhaust gas recirculation pipe.
14. the application of mixed oxide according to claim 13 is characterized in that, wherein the proportionate relationship of metallic atom is
The ratio of cerium is 0.1 to 0.5,
The ratio of titanium is 0.2 to 0.8,
The ratio of chromium is 0.1 to 0.5,
Wherein said mixed oxide also contains other metal oxide compositions, metal in wherein said other metal oxides is by choosing in following element set, that is: magnesium, calcium, strontium, barium, aluminium, gallium, indium, tin, and atomic number is until 79 transition elements, except technetium and cadmium; And lanthanide series, except promethium; The atomic ratio of wherein said these other metals adds up between 0 to 0.2.
15. the application of according to claim 13 or 14 described mixed oxides is characterized in that, described mixed oxide is used to oxidation of hydrocarbons.
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|---|---|---|---|
| DE102008032200.8 | 2008-07-09 | ||
| DE102008032200A DE102008032200A1 (en) | 2008-07-09 | 2008-07-09 | oxidation catalyst |
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| EP (1) | EP2143488B1 (en) |
| JP (1) | JP5661256B2 (en) |
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| DE102009009417A1 (en) | 2009-02-18 | 2010-09-09 | W.C. Heraeus Gmbh | Exhaust aftertreatment device for small-size motor, has catalyser arranged between two areas separated from each other, and tubular component leading from unconverted gas area and limiting converted exhaust gas area |
| US20120003132A1 (en) * | 2009-07-23 | 2012-01-05 | Shudong Wang | Process for catalytic deoxygenation of coal mine methane |
| CN101954287B (en) * | 2010-09-25 | 2012-06-13 | 东华大学 | Rare earth catalyst for treating hydrocarbon and preparation method thereof |
| US20120258266A1 (en) * | 2011-04-06 | 2012-10-11 | Basf Corporation | Coatings For Engine And Powertrain Components To Prevent Buildup Of Deposits |
| GB2519846B (en) * | 2013-08-28 | 2018-01-24 | Johnson Matthey Plc | Method of oxidizing excess CO in an exhaust gas |
| CN110013851B (en) * | 2018-01-10 | 2022-01-28 | 北京林业大学 | Monolithic catalyst and preparation method thereof |
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| US20020009406A1 (en) * | 2000-02-18 | 2002-01-24 | Kostantinos Kourtakis | Chromium-rare earth based catalysts and process for converting hydrocarbons to synthesis gas |
| DE10342162A1 (en) * | 2003-09-08 | 2005-04-07 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Material used e.g. in the production of anodes for high temperature fuel cells is made from a rare earth-calcium chromite-titanate |
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| JP2002001065A (en) * | 2000-06-21 | 2002-01-08 | Nkk Corp | Decomposition catalyst and decomposition method for organic chlorine compound |
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2008
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| US20100047143A1 (en) | 2010-02-25 |
| US8753999B2 (en) | 2014-06-17 |
| JP5661256B2 (en) | 2015-01-28 |
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| JP2010017707A (en) | 2010-01-28 |
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